Sorry, the system I was talking about involves a pH controller, 20lb tank, dual-stage regulator & all bits/pieces, reactor system (i.e. Cerges), tubing/check valves/etc, drop checker, dual manifold, etc. Not including the reactor system, the closest thing to that GLA offers is $870. Tack on shipping, bits and pieces, reactor, and you're pretty close to $1k.
i.e. A fully self-regulating, fail-safe, long-lasting, and high capacity/performance CO2 system.